1 static char sccsid[] = "@(#)setup.c 4.1 05/14/81"; 2 /* 3 * adb - routines to read a.out+core at startup 4 */ 5 #include "defs.h" 6 #include <stat.h> 7 8 off_t datbas; /* offset of the base of the data segment */ 9 off_t stksiz; /* stack size in the core image */ 10 INT sigcode; /* belongs in head.h */ 11 12 char *symfil = "a.out"; 13 char *corfil = "core"; 14 15 setsym() 16 { 17 off_t loc; 18 struct exec hdr; 19 register struct nlist *sp; 20 int ssiz; 21 char *strtab; 22 23 fsym = getfile(symfil, 1); 24 txtmap.ufd = fsym; 25 if (read(fsym, (char *)&hdr, sizeof hdr) != sizeof hdr || 26 N_BADMAG(hdr)) { 27 txtmap.e1 = MAXFILE; 28 return; 29 } 30 filhdr = hdr; 31 loc = filhdr.a_text+filhdr.a_data; 32 txtmap.f1 = txtmap.f2 = N_TXTOFF(filhdr); 33 txtmap.b1 = 0; 34 switch (filhdr.a_magic) { 35 36 case OMAGIC: 37 txtmap.b1 = txtmap.e1 = 0; 38 txtmap.b2 = datbas = 0; 39 txtmap.e2 = loc; 40 break; 41 42 case ZMAGIC: 43 case NMAGIC: 44 txtmap.e1 = filhdr.a_text; 45 txtmap.b2 = datbas = round(filhdr.a_text, PAGSIZ); 46 txtmap.e2 = datbas + filhdr.a_data; 47 txtmap.f2 += txtmap.e1; 48 } 49 loc = N_SYMOFF(filhdr); 50 symtab = (struct nlist *) malloc(filhdr.a_syms); 51 esymtab = &symtab[filhdr.a_syms / sizeof (struct nlist)]; 52 if (symtab == NULL) 53 goto nospac; 54 lseek(fsym, loc, 0); 55 if (filhdr.a_syms == 0) 56 goto nosymt; 57 /* SHOULD SQUISH OUT STABS HERE!!! */ 58 if (read(fsym, symtab, filhdr.a_syms) != filhdr.a_syms) 59 goto readerr; 60 if (read(fsym, &ssiz, sizeof (ssiz)) != sizeof (ssiz)) 61 goto oldfmt; 62 strtab = (char *) malloc(ssiz); 63 if (strtab == 0) 64 goto nospac; 65 *(int *)strtab = ssiz; 66 ssiz -= sizeof (ssiz); 67 if (read(fsym, strtab + sizeof (ssiz), ssiz) != ssiz) 68 goto readerr; 69 for (sp = symtab; sp < esymtab; sp++) 70 if (sp->n_strx) 71 /* SHOULD PERFORM RANGE CHECK HERE */ 72 sp->n_un.n_name = strtab + sp->n_un.n_strx; 73 nosymt: 74 if (INKERNEL(filhdr.a_entry)) { 75 txtmap.b1 += KERNOFF; 76 txtmap.e1 += KERNOFF; 77 txtmap.b2 += KERNOFF; 78 txtmap.e2 += KERNOFF; 79 } 80 return; 81 readerr: 82 printf("Error reading symbol|string table\n"); 83 exit(1); 84 nospac: 85 printf("Not enough space for symbol|string table\n"); 86 exit(1); 87 oldfmt: 88 printf("Old format a.out - no string table\n"); 89 exit(1); 90 } 91 92 setcor() 93 { 94 95 fcor = datmap.ufd = getfile(corfil,2); 96 if (fcor != -1 && INKERNEL(filhdr.a_entry)) { 97 struct stat stb; 98 99 fstat(fcor, &stb); 100 datmap.b1 = 0; 101 datmap.e1 = -1; 102 if ((stb.st_mode&S_IFMT) == S_IFREG) 103 datmap.b1 = 0x80000000; 104 return; 105 } 106 if (read(fcor, (char *)&u, ctob(UPAGES))!=ctob(UPAGES) || 107 !INUDOT(u.u_pcb.pcb_ksp) || !INSTACK(u.u_pcb.pcb_usp)) { 108 datmap.e1 = MAXFILE; 109 return; 110 } 111 signo = u.u_arg[0]; 112 sigcode = u.u_code; 113 filhdr.a_text = ctob(u.u_tsize); 114 filhdr.a_data = ctob(u.u_dsize); 115 stksiz = ctob(u.u_ssize); 116 switch (filhdr.a_magic) { 117 118 case OMAGIC: 119 datmap.b1 = 0; 120 datmap.e1 = filhdr.a_text+filhdr.a_data; 121 datmap.f2 = ctob(UPAGES) + datmap.e1; 122 break; 123 124 case NMAGIC: 125 case ZMAGIC: 126 datmap.b1 = round(filhdr.a_text, PAGSIZ); 127 datmap.e1 = datmap.b1 + filhdr.a_data; 128 datmap.f2 = ctob(UPAGES) + filhdr.a_data; 129 break; 130 } 131 datbas = datmap.b1; 132 datmap.f1 = ctob(UPAGES); 133 datmap.b2 = MAXSTOR - stksiz; 134 datmap.e2 = MAXSTOR; 135 if (filhdr.a_magic && u.u_exdata.ux_mag && 136 filhdr.a_magic != u.u_exdata.ux_mag) 137 printf("corefile not from this program"); 138 } 139 140 create(f) 141 char *f; 142 { 143 register int fd; 144 145 fd = creat(f, 0644); 146 if (fd < 0) 147 return (-1); 148 close(fd); 149 return (open(f, wtflag)); 150 } 151 152 getfile(filnam, cnt) 153 char *filnam; 154 { 155 register int fsym; 156 157 if (eqstr(filnam, "-")) 158 return (-1); 159 fsym = open(filnam, wtflag); 160 if (fsym < 0 && xargc > cnt) { 161 if (wtflag) 162 fsym = create(filnam); 163 if (fsym < 0) 164 printf("cannot open `%s'\n", filnam); 165 } 166 return (fsym); 167 } 168 169 setvar() 170 { 171 172 var[varchk('b')] = datbas; 173 var[varchk('d')] = filhdr.a_data; 174 var[varchk('e')] = filhdr.a_entry; 175 var[varchk('m')] = filhdr.a_magic; 176 var[varchk('s')] = stksiz; 177 var[varchk('t')] = filhdr.a_text; 178 } 179